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Long Lenses
A few things to remember about long or telephoto lenses. A long or telephoto lens is generally something like 150mm or more. Obviously, the main purpose of such a lens is to get close-up shots of far away subjects. But using such a lens can be tricky – it magnifies your subject, which means that if you don’t hold your camera perfectly still, your images may blur. And compared with a shorter lens, relatively less of the photo will be in focus (in other words, your depth of field will be shorter at a given f-stop). If your goal is to capture a whole scene, this can be a disadvantage.